Device for improving the purity of a product in a simulated moving bed that comprises forced fluid recirculation

A device suitable for chromatographic separation by a simulated moving bed of a feedstock, said device comprising at least one column (1) that is filled with an adsorbent, whereby the column comprises a number of beds (An) and a fluid distributor plate Pi between each bed, each distributor plate is divided into a number of sectors, and each sector comprises at least two fluid distribution chambers (CHi, CHj) that are pierced with orifices (18) and a fluid circulation space (8) near said orifices of the chambers, all of chambers CHi of a plate and all of chambers CHj of the same plate are connected respectively to a transfer line LTi and a transfer line LTj that extend between the chambers and a point that is located outside of the column, wherein transfer line LTi, which is associated with distribution chambers CHi of a plate Pi, is connected via a bypass line Li,j to transfer line LTj, which is associated with other distribution chambers CHj of this same plate Pi, and wherein the bypass line comprises means (15) for controlling and adjusting the flow of the fluid that circulates there.